try fetch-depth 5

Author: lobsterkatie

.github/workflows/build.yml

@@ -47,6 +47,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           ref: ${{ env.HEAD_COMMIT }}
+          fetch-depth: 5
       - name: Setup tmate session
         uses: mxschmitt/action-tmate@v3
       - name: Get commit message